Multiple omicron-ring



Oct. 29, 1963 J. P. WATSON 3,108,814

' MULTIPLE .O-RING Original Filed May 28, 1957 2 Sheets-Sheet 2 INVENIOR United States Patent 3,108,314 MULTIPLE O-RING James P. Watson, Whittier, Calif.

(59 Waterway Road, Waterway Village, Jupiter, Ella.) Griginal application May 28, 1957, Set. No; 662,1ll9, now

Patent No. 2,983,798. Divided and this application Sept. 19, 1966, Ser. No. 61,045

1 Qlaim. (ill. 277--32) This application is a division of copending United States Patent application Serial No. 662,109, filed May 28, 1957 in the name of James P. Watson, which issued May 9, 1961 at Patent No. 2,983,798 entitled Stepping Motors and Switches.

It is an object of this invention to provide a one piece seal ring and casing joint combination which will be economical to make, simple to use and will seal the easing joint and any number of additional parts which pass radially thru the joint.

In accordance with these and other objects which will become apparent hereinafter, preferred forms of the present invention, as used in conjunction with a stepping motor and switch will now be described with reference to the accompanying drawings wherein:

FIGURE 1 is a longitudinal sectional view of a stepping motor and switch;

FIGURE 2 is a cross-section taken on a line 22 of FIGURE 1;

FIGURE 3 is a fragmentary view taken in the same plane as FIGURE 2 and showing a modification embodying the sealing ring feature of the present invention; and

FIGURE 4 is a fragmentary section taken on line 4-4 in FIGURE 3.

Referring to the drawings, and particularly to FIG- URES 1 and 2, there is illustrated a cylindrical casing 31 formed of a plurality of abutting cylindrical sections 32, 33, 34. and 35. An end wall 37 formed integral with the section 32 closes the left end of the casing 31, and an end wall 38 closes the right end of the casing. Spanning the end walls 37 and 38 and journalled therein by bearings 39 and 41, is a shaft 42, over which is journalled a paramagnetic rotor 43.

The shaft 42 projects leftward beyond the rotor 43 nto the left-hand portion of the casing 31 and there serves to actuate one or more rotary switches contained within the single casing 31. In the present instance, two 1 such switches are shown, one being mounted in the casing section 33, and the other in the end casing section 32.

In order to seal two adjacent cylindrical casing sec tions, as for example 32 and 33, to each other, and also seal them to the arious conductors 194 where the conductors enter the casing, a sealing ring 130 constructed in accordance with the present invention is illustrated in FIGURES 3 and 4. This ring consists of a major ring 181 made of pliant material and formed about a major axis which coincides with the axis of the shaft 42. At each point where a conductor 1% is to penetrate the casing 31, a minor ring 182 is formed in the major ring 181 and made of diameter appreciably smaller than the diameter of the major ring. The minor ring is disposed substantially on the surface of an imaginary cylinder formed about the major axis i.e. the shaft 42. The cross section of the material of both major and minor rings is circular and of uniform diameter.

3,198,8ld Patented Get. 29, 1963 slightly smaller than the external diameter of the lead 104, so as to grippingly engage the lead as it passes through the minor ring 182.

Eachof the opposed end faces of the joined cylindriw cal casings 32 and 33 is formed with complementary semi-circular cross bores 183, which together form a single circular bore for reception and passage of the lead AM. Grooves 18d and 186 are formed in the respective end faces or edges of the cylinders 32 and 33, and extend continuously around the faces including the faces of the semi-circular bores, as shown at .137 in FIGURE 4. Grooves res and 136 are of uniform depth throughout their respective lengths.

Where the lead 194 passes through the wall of the casing 31, the interspace between the strands of the conductors is filled with solder as shown at 199 in FIG- URE 4.

The relative dimensions of the pliant ring or sealing member 18% and the grooves 184 and 186 are such that all portions of the pliant ring 180 are compressed as the two sections 32 and 33 are drawn tightly into engagement with each other by tightening action on the several dowels 116.

In this way, the single sealing member 18% serves the double function of sealing the cylindrical casings 32 and 33 to each other, and also to the several leads or conductors 1% where they enter the casing 31.

While the instant invention has been shown and described herein in what is conceived to be the most practical and preferred embodiments, it is recognized that departures may be made therefrom within the scope of the invention, which is therefore not to be limited to the details disclosed herein, but is to be accorded the full scope of the claim.

What is claimed is:

Sealed structure comprising a pair of cylindrical casings having substantially the same diameter and a pair of opposed end faces with complementary semicircular cross bores through said casing formed in said opposed end faces, a cross member passing through the bore formed by said opposed semicircular, cross bores, a groove formed in each end face and continuous therearound including the face of the semicircular bore, said groove being of uniform depth throughout its length, a one piece resilient seal member disposed in said grooves and having an aperture located in the center of the cross bore to allow the passage of the cross member through the cylindrical walls, said seal member being of uniform, circular cross section and of such dimensions relative to the containing grooves and cross member that all portions of said seal member are compressed by assembly of the cylindrical casings, thereby forming a continuous pressure tight seal between the cylindrical casings and hetween the cylindrical casings and the cross member.

References Cited in the file of this patent UNITED STATES PATENTS 

